2002 Mazda Millenia "po421 warm catalyst" Questions

...po421 warm up catalyst efficiency below threshhold bank 1, 431 same on bank 2.. P0421 ...... Warm Up Catalytic Converter - Efficiency Threshold (Bank 1) P0431 .... Warm Up Catalytic Converter - ...

...po421 is the warm up catalyst efficiency below threshold-bank-1)How do i find out (1- what that is)( 2- how to fix it.) you have the same engine as my 2003 Galant, this should help... ...

...po421 catalytic converter code [warm up catalyst efficiency below threshold bank 1] means the o2 sensor is detecting low oxygen in exhaust problem can be cat conv going bad---o2 sensor faulty-and or ...

...PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1) PO430: Catalyst System Efficiency Below Threshold (Bank 2) PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2) THINGS TO ASK ...

...po421 warm up cat bank 1 code p1250 control fuel air meter Hi if the catalyst was replaced or eliminated this code p421 will always come out p1250 is that there's a problem with the ignition switch ...

NEED TO KNOW WHAT IS THI P0421 ERROR CODE ERROR CODE P0421 PO421:Warm Up Catalyst-below threshold (bank #1) CEL

po421 on 2008mazda 6 touring the error code means:    Warm-Up Catalyst Efficiency Below Threshold (Bank 1) . That's either a filter problem or a sensor problem

...PO421 warm-up catalyst efficiency below threshold [bank 1] means the o2 sensor after the cat converter is detecting that ur cat is not working up to specs [correctly] can be a fouled plug-faulty o2 ...

po421 code obd P0421....Warm Up Catalyst Efficiency Below Threshold (Bank 1) the the heaters on the O2 sensors -two white wires on sensor check for continueity

...po421 warm up catalyst below threshold Possible causes- Warm Up Three Way Catalytic converter deterioration or malfunction - Exhaust system leaks - Loose front or rear HO2Ss - Faulty front heater O2 ...